For testing appliances, the wattage of test lamp should be_____________?

Related Mcqs:

1. In a lamp load when more than one lamp are switched on the total resistance of the load_____________?

   A. increases
   B. decreases
   C. remains same
   D. none of the above

2. Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?

   A. arcs across separating contacts
   B. mechanical noise of high intensity
   C. both mechanical noise and arc between contacts
   D. none of the above

3. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?

   A. 160 ohms
   B. 80 ohms
   C. 20 ohms
   D. 10 ohms

4. A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?

   A. 80 m
   B. 60 m
   C. 40 m
   D. 20 m

5. Which of the following quantities consists of SI unit as WATT ?

   A. Force
   B. Charge
   C. Current
   D. Power

6. The property of a conductor due to which it passes current is called___________?

   A. resistance
   B. reluctance
   C. conductance
   D. inductance

7. Which of the following material has nearly zero temperature co-efficient of resistance_________?

   A. Manganin
   B. Porcelain
   C. Carbon
   D. Copper

8. The filament of an electric bulb is made of______________?

   A. carbon
   B. aluminium
   C. tungsten
   D. nickel

9. If the efficiency of a machine is to be high, what should be low __________?

   A. Input power
   B. Losses
   C. True component of power
   D. kWh consumed
   E. Ratio of output to input

10. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?

    A. 1/9 times
    B. 3 times
    C. 9 times
    D. unchanged